i am not an expert but i think you should use ollydbg (or something similar) to disassemble it and then change the date and copy it to execuatable then save the file..
if you want to learn more on how to use olly see this linkhttp://www.tuts4you.com/download.php?list.17
go through first few tuts you'll get the idea.

So, You have the disassembled program (you've posted). The date comparison is clearly performed at the two VAs : loc_6A4393 and loc_6A43AA.
You can use Olly to patch the program at these addresses. But you have to take care of several things like Olly shows you the disassembled code, not decompiled. So, the date might be stored as HEX, may be the date is stored at a different address and the current time is compared to it etc ...